I may trying to find out about a computer code that keeps come up on my 1998 ford f-150. I first rec the code P0133 and Talked to auto zone and replaced the #1 O2 sensor but shortly after that the engine light come back on and has been #P1131 and my book saids its "Lack of HO2S11 switches-sensor indicates lean" So I have cleaned it three times. But it keeps come back!! Need Help? Also the truck does hesitates at low speeds and at cold starts. I have never has any problems with is truck untill now
PS: it has 45,900 miles on it. Thanks